How is a 3 season porch factored into the market valuation of a home?My friend has a small but lovely home with a 385 sq ft 3-season porch. It definitely adds to the home, but how does one go about calculating the additional market value?January 31 2012 - Magnolia Heights00YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.